I recently picked up a 12ga Husqvarna 103cs hammer gun choked xxf/xxf, and it puts both barrels exactly dead on to poa, from 20 yds to 40 yds. Loaded with 1 1/2oz. of nice shot, those xxf tubes put an incredibly lethal ink blot of shot on paper. I only mention this with regards to convergence issues. Some sxs's have problems with this, and some do not. If it were me in search of such a specialized tool, I wouldn't settle on any particular gun until I've had a chance to pattern it, regardless of how much it weighs.